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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bedb80f9bb8e99d53876b7f4221030400100999f6c7ddca76b3d44704b3cf8aa' 
  AND token = 'tpxR1wp583w1Z0fmYqrC6JQIZ9tdbFgn2gXimX2CKn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}